用 java 8 API 替换两个嵌套的 for 循环
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时间：2020-08-11 09:31:14 来源:igfitidea点击:
Replace two nested for loops with java 8 API
提问by tplacht
I have the following snippet and I wonder if and how it is possible to replace it with Streams/Java 8 API
我有以下代码段，我想知道是否以及如何用 Streams/Java 8 API 替换它
for (State state : states) {
for (City city : cities) {
if (state.containsPoint(city.getLocation())) {
System.out.printf("%30s is part of %-30s\n",
city.getName(), state.getName());
}
}
}
采纳答案by Vartlok
Will be something like that:
将是这样的：
// first loop
states.forEach(state -> {
// second loop for filtered elements
cities.stream().filter(city -> state.containsPoint(city.getLocation())).forEach(city -> {
System.out.printf("%30s is part of %-30s\n", city.getName(), state.getName());
});
});
